First 2012 R2 server in 2008 domain (same name and IP)

Hi all,
Think I know the answer to this but wanted to double-check. I'm installing a Windows 2012 R2 server. It is our first 2012 server in our 2008 R2 environment. It will also be our first 2012 DC. It will be replacing an old 2008 R2 DC and will have the same
name and IP as the old 2008 server. I have several other DCs in place and they handle DHCP and DNS. The DHCP server service is not currently running on the old 2008 server to be decommissioned, and the DNS settings in DHCP server/scope options point to other
servers than the server to be shut down.
Plan is to demote the old 2008 R2 server, wait 24 hours for directory replication and check that all instances of the old server is gone from AD, then rename the old server and assign different IP address. At that point I'll assign the 2012 server the old
server's original IP address and name, then run Server Manager to promote the 2012 server to a DC. Then migrate data.
So, when running DCPROMO to demote the old 2008 server, I'm asked if I want to delete the DNS delegations pointing to this server. Should I? I tend to think I should NOT because the new 2012 server will have the same name and IP as the old one, and that
the DHCP/DNS settings as configured point to other servers anyway. Does that make sense?
Thanks in advance,
Sir_Timbit

Hi Timbit,
Here is a nice walkthrough article below which is written by Ace:
Remove an Old DC and Introduce a New DC with the Same Name and IP Address
http://blogs.msmvps.com/acefekay/2010/10/09/remove-an-old-dc-and-introduce-a-new-dc-with-the-same-name-and-ip-address/
Best Regards,
Amy

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